The time it takes from precancerous lesion to cancer varies from person to person, and it usually takes about 8-15 years. First of all, the period of precancerous lesions does not mean having cancer, whether it is detected and treated in time will directly affect the time to develop cancer. Secondly, the duration and symptoms of cancer vary due to the location of the tumor. In addition, the patient’s personal constitution and whether he or she actively cooperates with the treatment will have an impact on the length of cancer. If the disease is well controlled during the pre-cancerous period, it usually will not cause cancer. Therefore, it is important to go to the hospital in a timely manner when physical discomfort occurs to try to stop or delay the transformation of precancerous lesions to cancer. Patients are advised to have a regular diet and rest, eat a light diet, eat less stimulating food and exercise actively. Patients who are diagnosed with cancer should also maintain a positive and optimistic attitude and cooperate with the treatment.